LDEF (Postflight), M0003 : Space Environment Effects on Spacecraft Materials, Tray D03 EL-1994-00210 LDEF (Postflight), M0003 : Space Environment Effects on Spacecraft Materials, Tray D03 The postflight photograph was taken in SAEF II at KSC after the experiment tray was removed from the LDEF. The Spacecraft Materials Experiment hardware consist of four LDEF peripheral trays (two sets), two Experiment Power and Data Systems (EPDS), two Environment Exposure Control Canisters (EECC), twelve LiSO2 batteries and internal support structure, instrumentation and black anodized aluminum mounting plates for experiment samples. The experiment structural members were assembled using nonmagnetic stainless steel fasteners. One six inch tray and one three inch tray with a connecting wiring harness, one EPDS, one EECC and six LiSO2 batteries were located in tray locations D08 and D09 near the LDEF leading edge and a similar set of hardware was located near the LDEF trailing edge in tray locations D03 and D04. The environmental exposure was similar with one significant exception, the trailing edge location was not exposed to continuous bombardment by the relativity high atomic oxygen flux. The experiment tray in the D03 location is divided into six sections. One of the six sections, lower right corner, provides space for one of three Trapped Proton Energy Spectrum Determination Experiment, M0002-01, modules. The other five sections of the tray contain M0003 sub-experiments consisting of coatings, thermal paints, polymers, glasses, composites, semi-conductors and detectors that provide data on various environmental parameters.The experiment appears to be in good condition. Composite material samples located in upper right, upper center and lower center tray sections remain intact but are bleached or discolored. The metallized and coated polymers located in the upper left tray section appear to be have survived the exposure intact but appear discolored. Approximately half of the thin film polymers in the lower left tray section are loose at one end but remain attached. The silver TEFLONΆ_ covers, the large square and the rectangular shapes in the center of the lower left section, appear to remain intact but have changed from silver to a milky white color where components are located beneath and to a golden color where no component is located. Thermal coatings in many locations are discolored by a light tan stain as are the exposed surfaces of the sample holders. The solar cell arrays appear to remain intact but two individual thin film cells appear to be buckled or missing.